Roller skate



FIG. 1 is a perspective view, taken from above, of a roller skate showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for the roller skate, as shown and described. 